Posted: 04/19/2013 - Chase moved into high gear with murder of MIT campus police officer.
Posted: 04/19/2013 - Government invoking "public safety exception."
Updated: 04/20/2013 - Teenager surrenders after day-long manhunt.
Posted: 04/16/2013 - Family does not want victim's name released.
Posted: 04/16/2013 - Obama: FBI investigating explosions as `an act of terrorism', orders flags at half-staff
Updated: 04/16/2013 - President Obama to deliver a statement on the Boston Marathon explosions at 11:30 a.m. EDT.